In the next version of Bun
`bun build --react-compiler` runs the React Compiler in Rust
On a large React codebase, it's 19x faster than the Babel plugin
1:49 AM · Jun 19, 2026 · 56.2K Views
Bun creator Jarred Sumner says upcoming Bun release runs React Compiler natively in Rust, beating Babel by 19.8x
Story Overview
Bun's upcoming release embeds Meta's React Compiler directly into its Rust-based bundler, letting developers trigger automatic memoization during builds with a simple flag and delivering nearly 20x faster wall times than the standard Babel plugin on sizable React projects.
38712245675.5K
Developer Impact
The Rust fork powers the measured gains
A benchmark on a large codebase shows the new path finishing in 484 ms versus 9.58 seconds for the Babel plugin, a 19.8x improvement achieved by forking the upstream compiler and adding targeted optimizations while still passing the shared test suite.
Open Question
Exact arrival date stays unspecified
The feature is described only as landing in the next version of Bun with no version number, timeline, or additional integration details provided for frameworks that might adopt it.
Sentiment
Many users praised Bun's new Rust-based React compiler for delivering major speedups like 19x faster builds, while others complained about the lack of promised blog posts.
Pos
77.2%
Neg
22.8%
12 comments with sentiment.
Cluster Engagement
Digg Deeper
No Digg Deeper questions have been answered for this story yet.
Posts from X
Most Activity
Most Activity
VIEWS7.1K
Jarred Sumner@jarredsumner
It runs the same test suite as the upstream react compiler version with tests for flow type and meta’s intl library skipped
Jarred Sumner@jarredsumner
In the next version of Bun
`bun build --react-compiler` runs the React Compiler in Rust
On a large React codebase, it's 19x faster than the Babel plugin
6hViews 7.1KLikes 45Bookmarks 0
BOOKMARKS4LIKES60REPLIES3
xjdr@_xjdr
i gotta say, i switched to bun for everything and its been really nice. very impressive work all around and am looking forward to trying this out . as someone relatively new to the frontend world, this is a set of tools that just seem to work
Jarred Sumner@jarredsumner
In the next version of Bun
`bun build --react-compiler` runs the React Compiler in Rust
On a large React codebase, it's 19x faster than the Babel plugin
2hViews 3.9KLikes 60Bookmarks 4
RETWEETS1
Jarred Sumner@jarredsumner
I did spend some time making it faster for bun’s usecase
Jarred Sumner@jarredsumner
It runs the same test suite as the upstream react compiler version with tests for flow type and meta’s intl library skipped
6hViews 6.1KLikes 32Bookmarks 0
Jarred Sumner@jarredsumner
@jimmycallin It’s a fork with a small number of changes
4hViews 605Likes 5
kache@yacineMTB
@jarredsumner wow..
Jarred Sumner@jarredsumner
In the next version of Bun
`bun build --react-compiler` runs the React Compiler in Rust
On a large React codebase, it's 19x faster than the Babel plugin
2hViews 678Likes 5Bookmarks 0
Jimmy Callin@jimmycallin
@jarredsumner is this using the official rust port or your own reimplementation? if the latter - why?
4hViews 651
vlod@vlod
@fristovic_ @jarredsumner Maybe you don't realize how rude you message is. With open source, he doesn't have to do anything. You should know that.
4hViews 51Likes 2
Anshuman Khanna@AnshumanKhanna5
@jarredsumner Node.js - Runtime Environment
Deno - Secure Runtime Environment with some commonly required tooling
Bun - Entire JS ecosystem
5hViews 180Likes 1
Meir Blachman@MeirBlachman
@jarredsumner How does it compare to esbuild ?
6hViews 101
ajay@ajaystwt
@jarredsumner at this point, the blog post of bun rewrite has become a joke. no matter what jarred posts everyone just wants a blog post
6hViews 194Likes 2
Jimmy Callin@jimmycallin
@jarredsumner any plans to try to upstream the changes?
4hViews 146Likes 2
Yunfei He@_hyf0
@jarredsumner How much does the binary size increase?
6hViews 100Likes 1
Jarred Sumner@jarredsumner
@MeirBlachman This codebase doesn’t use it but bun’s bundler plugins snd esbuild’s plugins work similarly and afaik esbuild doesn’t have a react compiler builtin so it probably is the same as the Babel version
5hViews 82Likes 1
Filip@fristovic_
@jarredsumner Is writing the promised Blog a joke to you? Concentrate please.
6hViews 204
Johannes Copeland@AIByJohannes
@jarredsumner Having a standard library is much needed for tasks like these. Awesome work!
4hViews 171
RFTW@ZH1YGD
@jarredsumner Congrats, but where is the blog article and the comparison btw Zig and Rust?
6hViews 146
Layth@Fullmoon211
@jarredsumner bun build --when-blog
Warning: The resulting post is 99.8% complete, but it includes a memory leak where the author forgets to publish it.
6hViews 37Likes 1
Jarred Sumner@jarredsumner
@typosquattage React is 13 years old and still wildly popular. React-specific flags for React-specific functionality is fine.
6hViews 36Likes 1
Tiger Chen & 前端之虎陈随易@chenbimo
@jarredsumner So, on what day will the next Bun be officially released?
6hViews 116
Gene Semerenko ☮️@vpsguy
@jarredsumner In the next version of Bun I tend to use Node again.
6hViews 112
Load more posts